Fix crash on MacOSX 10.7
Fix linker script for xc16
rc5: Enable extended mode processing

The second start bit is used as the inverted 7th data bit of command.
This enable to use more advanced features of remote controls.
Mode: Remote control (purple)

Improve remote control compatibility
Thymio-II: V6 firmware release
Merge branch 'master' into rf

Conflicts:
	main.c
skel-usb: fix inline assembly

And provide a C alternative to it (disabled by default)
ir_prox: Add autocalibration feature

By default, the sensors will autocalibrate and flash the calibration
in the settings automatically (if Vbat > 3.3V).

To disable this feature, you have to write -1 into the settings 1-8.
To retrigger a complete calibration, write 0 into the settings 1-8.